Police say an Ohio high school canceled classes, after two teenage girls made threats similar to ones on the TV show 'Pretty Little Liars.'

Piqua police say the girls, ages 14 and 15, have been arrested and charged in Juvenile Court for threats that led to an early dismissal on Thursday and the cancellation of classes on Friday at Piqua High School, about 85 miles west of Columbus, Ohio.

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Police say the 15-year-old created a Snapchat account using the letter “A”, the Pretty Little Liars character who sends threatening messages. They posted threats about exposing classmates’ secrets, prompting false rumors about a school shooting.

Police say the posts prompted the 14-year-old to write on a bathroom mirror: “I’m still going to shoot up the school. A.”